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Ultrahigh-temperature ceramic composite material and preparation method
The invention relates to an ultrahigh-temperature ceramic composite material and a preparation method thereof, and concretely relates to a (Hf0.25Ta0.25Zr0.25Ti0.25)B2-SiC-Si composite material and apreparation method thereof. Firstly, transition metal oxide and boron powder which serve as raw materials undergo a boronothermic reaction to prepare (Hf0.25Ta0.25Zr0.25Ti0.25)B2 ceramic powder, and compared with commercial boride, the powder is smaller in size, high purity and uniform in component; SiC is introduced as an additive to promote sintering of the high-entropy ceramic, reduce the sintering temperature and inhibit grain growth; and through infiltration of Si steam, pores and other defects in the ceramic can be effectively filled through gas phase siliconing, and finally, the (Hf0.25Ta0.25Zr0.25Ti0.25)B2-SiC-Si composite material with relatively high density is rapidly formed.
本发明涉及一种超高温陶瓷复合材料及制备方法，具体为(Hf0.25Ta0.25Zr0.25Ti0.25)B2‑SiC‑Si复合材料及其的制备方法、首先以过渡金属氧化物和硼粉为原料，通过硼热反应制备(Hf0.25Ta0.25Zr0.25Ti0.25)B2陶瓷粉体，该粉体与通过市售硼化物相比尺寸较小，纯度高且组分均；引入SiC作为添加剂，促进高熵陶瓷的烧结，降低烧结温度，并抑制晶粒生长；气相渗硅工艺通过Si蒸气的渗入，能有效填充陶瓷中的孔隙等缺陷，最终快速形成致密度较高的(Hf0.25Ta0.25Zr0.25Ti0.25)B2‑SiC‑Si复合材料。
Ultrahigh-temperature ceramic composite material and preparation method
The invention relates to an ultrahigh-temperature ceramic composite material and a preparation method thereof, and concretely relates to a (Hf0.25Ta0.25Zr0.25Ti0.25)B2-SiC-Si composite material and apreparation method thereof. Firstly, transition metal oxide and boron powder which serve as raw materials undergo a boronothermic reaction to prepare (Hf0.25Ta0.25Zr0.25Ti0.25)B2 ceramic powder, and compared with commercial boride, the powder is smaller in size, high purity and uniform in component; SiC is introduced as an additive to promote sintering of the high-entropy ceramic, reduce the sintering temperature and inhibit grain growth; and through infiltration of Si steam, pores and other defects in the ceramic can be effectively filled through gas phase siliconing, and finally, the (Hf0.25Ta0.25Zr0.25Ti0.25)B2-SiC-Si composite material with relatively high density is rapidly formed.
本发明涉及一种超高温陶瓷复合材料及制备方法，具体为(Hf0.25Ta0.25Zr0.25Ti0.25)B2‑SiC‑Si复合材料及其的制备方法、首先以过渡金属氧化物和硼粉为原料，通过硼热反应制备(Hf0.25Ta0.25Zr0.25Ti0.25)B2陶瓷粉体，该粉体与通过市售硼化物相比尺寸较小，纯度高且组分均；引入SiC作为添加剂，促进高熵陶瓷的烧结，降低烧结温度，并抑制晶粒生长；气相渗硅工艺通过Si蒸气的渗入，能有效填充陶瓷中的孔隙等缺陷，最终快速形成致密度较高的(Hf0.25Ta0.25Zr0.25Ti0.25)B2‑SiC‑Si复合材料。
Ultrahigh-temperature ceramic composite material and preparation method
一种超高温陶瓷复合材料及制备方法
FU QIANGANG (author) / ZHOU LEI (author) / LI HEJUN (author) / ZHANG JIAPING (author) / HU DOU (author) / WEI YALONG (author) / LI XINGANG (author) / TONG MINGDE (author)
2020-12-04
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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